Fusing Equipment
Electrical Apparatus-
240-55
ELX Full Range Current-Limiting Fuse
GENERAL
The ELX fuse is a full range currentlimiting fuse designed to provide
overcurrent protection. It is completely
interchangeable with similar fuses using
industry standard clip-style and dry well
canister mountings.
Quiet, safe operating characteristics
of the ELX fuse make it ideal for
installations where flame discharge and
loud operation are undesirable.
Typical applications include clip
mounting air-insulated apparatus, padmounted equipment sectionalizing
enclosures, metalclad switchgear and
industrial vaults. Since the ELX fuse has
no gas-evolving parts, it is ideal for use
in dry well canisters. This fuse is also
used in field refusible bushings, such as
those used on pole-type and livefront
pad-mounted transformers.
Both deadbreak and loadbreak dry
well canister manufactured by Cooper
Power Systems, General Electric,
Westinghouse, and Kuhlman can be
re-fused using the ELX fuse.
Figure 1.
ELX Full Range Current-Limiting Fuse.
PRODUCTION TESTS
Tests are conducted in accordance
with Cooper Power Systems
requirements.
„ Physical Inspection
„ I2t Testing
„ Resistance Testing
TABLE 1
Electrical Characteristics
Fuse Type
General Purpose (Full Range)
"C" Rated
Maximum
Interrupting
Current
50,000 A rms
symmetrical
TABLE 2
Electrical Ratings
8.3 kV1
15.5 kV2
23 kV
"C" Rating
(A)
Minimum
Melt I2t
(A2zs)
Maximum
Clear I2t
(A2zs)
Minimum
Melt I2t
(A2zs)
Maximum
Clear I2t
(A2zs)
Minimum
Melt I2t
(A2zs)
Maximum
Clear I2t
(A2zs)
3
820
4,700
820
4,700
820
4,700
6
820
4,700
820
4,700
820
4,700
8
1,458
9,800
1,458
9,800
1,458
9,800
12
1,458
9,800
1,458
9,800
1,458
9,800
18
2,277
13,800
2,277
13,800
2,277
13,800
20
2,277
13,800
2,277
13,800
2,277
13,800
25
3,280
27,300
3,280
27,300
3,280
27,300
30
9,100
53,400
9,110
53,400
9,110
56,650
40
9,100
53,400
9,110
53,400
9,110
56,650
50
17,800
86,700
17,800
75,600
13,120
69,200
60
36,440
213,200
36,440
226,600
36,440
226,600
80
36,440
213,200
36,440
226,600
36,440
226,600
100
71,200
327,000
71,200
327,000
-
-
1. Tested and approved through 9.9 kV except for 50 A rated fuse.
2. Tested and approved through 17.2 kV at 50 kA except for 50 A rated fuse which is tested and
approved through 15.5 kV at 20 kA maximum interrupting current and parallel 50 A fuses tested
and approved through 15.5 kV at 11 kA maximum.
Shaded area indicates parallel fuse applications.
February 2007 • Supersedes 1/90
Printed in U.S.A.
1
ELX Full Range Current-Limiting Fuse
HIGH PURITY SILICA SAND FILLER
Specific particle size, purity and compaction gives
the heat-absorbing and arc-quenching properties
necessary for consistent clearing and low energy
let-through.
FIBERGLASS HOUSING
Provides strength and maintains
integrity of fuse during any
interruption, from minimum melt
up to maximum rated current of
50 kA rms.
Y
Z
0.623"
(16 mm)
1.0" dia.
(25 mm)
2.15" dia.
(55 mm)
MICA SPIDER
Provides stable winding
support without generating
gas and pressure buildup
during fuse operation.
0.8"
(20 mm)
LOW CURRENT
CLEARING SECTION
Provides consistent, reliable clearing of all
currents high enough to melt the element
without auxiliary devices or elements. The
low current elements provide time-current
characteristics similar to EEI-NEMA T-type
expulsion links.
INDELIBLE
IDENTIFICATION LABEL
Includes easy-to-read
voltage and current ratings
and catalog number.
PURE SILVER ELEMENT
Stable under current cycling
and thermal stress, providing
consistent melt characteristics.
The punched-hole ribbons
effectively control and minimize
peak arc voltage levels resulting
from high current interruption.
The element effectively controls
and limits both current and
energy (I2t) let-through during
interruption.
Figure 2.
ELX Full Range Current-Limiting Fuse cutaway shows detail and dimensions. This fuses's dimensions allow mounting in
industry standard clip-style and dry well canister mountings.
NOTE: Dimensions given are for reference only.
ORDERING INFORMATION
TABLE 3
ELX Fuse Dimensional Information
in./(mm)
Voltage
(kV)
Mounting
Code
Y
Z*
8.3
4
10.11
(257)
8.20
(208)
15.5
5
14.37
(365)
12.46
(316)
23.0
6
17.21
(437)
15.41
(391)
*Maximum allowable length, including 0.060 in. thick
solder tab at each end.
To order an ELX full range currentlimiting fuse, determine the amperage
and voltage requirements of the
application and specify the fuse
required from Table 4. For parallel
fusing, order two fuses.
TABLE 4
ELX Full Range Current-Limiting Fuse
Continuous Current
Rating (A)
3
6
8
12
18
20
25
30
40
50
60
80
100
Catalog Number
8.3 kV
3563003M11M
3563006M11M
3563008M11M
3563012M11M
3563018M11M
3563020M11M
3563025M11M
3563030M11M
3563040M11M
3563050M11M
3563030M11M
3564040M11M
3563050M11M
Shaded area indicates parallel fuse applications.
2
15.5 kV
3564003M11M
3564006M11M
3564008M11M
3564012M11M
3564018M11M
3564020M11M
3564025M11M
3564030M11M
3564040M11M
3564050M11M
3564030M11M
3564040M11M
3564050M11M
23 kV
3565003M11M
3565006M11M
3565008M11M
3565012M11M
3565018M11M
3565020M11M
3565025M11M
3565030M11M
3565040M11M
3565025M11M
3565030M11M
3565040M11M
–
240-55
METHOD A
Using the Correlation Tables
Use the correlation information in
Tables 5 and 6 to determine the
amperage and voltage ratings of the
fuse required for the application. Then
use Table 4 to determine the fuse
catalog number.
Correlation is based on IEEE Standard
C57.92™ Loading Guide and IEEE
Standard C57.109™ Through-Fault
Guide, and Cooper Power Systems'
Fusing Application Guide CP7662A.
Contact your Cooper Power Systems
representative for further information or
other applications.
TABLE 5
Recommended Fuse Current Ratings (A) for Fuse in Dry Well Canister
8.3 kV
15.5 kV
23 kV
Nominal Single-Phase Voltage (kV) Phase-to-Ground
SinglePhase
Transformer
kVA
A
B
A
10
6
8
3
15
8
12
-
8
25
18
20
6
12
2.4
4.16
4.8
B
6a
A
7.2
7.62
12.0
14.4
16.0
19.9
B
6a
A
B
A
B
A
B
A
B
A
B
A
B
-
-
-
3a
3a
-
3
3a
3a
-
3
3a
3a
-
6
3a
6a
-
-
3a
6a
3a
3a
6
12
-
6
-
6
3
6a
-
-
-
3
-
-
-
37.5
20
30
12
18
12
18
6
12
6
8
-
6
3
3
6a
3
3a
6a
3
3
6a
50
30
40
18
20
18
20
8
12
8
12
-
6
-
6
-
6
3
6a
75
50
25
40
20
30
8
20
12
20
6
12
6
12
6
8
-
6
100
50
30
50
25
40
167
250
333
500
50
20
25
20
25
12
18
8
12
6
12
6
8
30
50
30
50
20
25
18
25
18
20
12
18
50
50
25
40
20
40
20
30
18
25
40
50
30
50
25
40
20
30
50
40
40
NOTE: Recommendations are based on fuse melting characteristics at a maximum oil temperature of 100°C. Recommended fuses meet inrush criteria of
12 times transformer full load for 0.1 second, and 25 times transformer full load for 0.01 second. Fuses have been derated 12% plus 0.2% per degree C
above 25°C for dry well canister application.
Column A = 140 - 200% of transformer rating.
Column B = 200 - 300% of transformer rating.
Shaded area indicates parallel fuse applications.
a. Fuse allows load greater than 300%.
3
ELX Full Range Current-Limiting Fuse
ORDERING INFORMATION (continued)
TABLE 6
Recommended Fuse Current Ratings (A)
8.3 kV
Three-Phase
2.4
Transformer
kVA
A
B
ELX Fuse Mounted in Airb
15
6a
22.5
6
30
8
12
4.16
4.8
A
B
A
B
3
-
3
6a
6
3
-
3
6a
6a
45
12
18
6
8
75
20
40
12
18
100
25
40
18
20
112.5
30
40
18
20
150
40
50
20
30
200
50
80
30
40
225
60
80
40
50
300
80
50
60
500
80
750
1000
1500
2000
2500
3000
ELX Fuse Mounted in Dry Well Canisterc
6a
15
6
3
22.5
6
12
6
30
8
18
6
45
18
20
6
12
75
25
40
18
20
100
40
50
20
25
112.5
40
50
20
30
150
50
80
25
40
200
80
40
50
225
80
40
60
300
50
80
500
100
750
1000
1500
2000
2500
3000
-
15.5 kV
Nominal Three-Phase Voltage (kV) Phase-to-Phase
7.2-7.96
8.32
12.47
13.2-14.4d
A
B
A
B
A
B
A
B
3
3a
3
6a
6
8
12
18
18
20
40
50
50
3
6
8
12
18
20
20
30
50
80
100
-
6
12
18
18
20
25
40
40
80
-
8
18
20
20
25
40
50
50
-
6
8
8
18
20
25
25
40
60
80
-
6a
8
12
18
20
25
30
40
60
100
-
3
6
12
18
20
25
30
40
50
80
-
6a
6
6
12
18
20
25
40
50
50
80
-
3
3
6
12
12
18
20
25
30
50
80
-
3
6a
6a
6
12
18
18
20
30
40
50
80
-
3a
3
23 kV
20.8
A
B
22.9-24.9e
A
B
34.5e
A
B
-
3a
3a
3a
-
3a
3a
3a
-
3a
3a
3a
-
3a
3a
3a
-
3a
3a
3a
8
12
12
18
25
40
50
80
-
3
6a
6
6
12
18
18
20
40
50
80
-
6
12
12
18
25
40
50
80
100
-
3
6
12
12
18
20
30
30
50
80
80
-
6a
6
6
12
18
18
20
40
50
80
-
3
3
6
6
8
18
25
30
50
60
80
-
3a
3
6a
6a
3
3
8
18
20
30
40
50
80
80
3a
3
6a
6a
3
3
6
12
18
20
25
40
50
60
3a
3a
3a
3
6a
6
12
12
18
20
25
30
40
80
-
3
6
6
8
12
18
20
30
50
60
100
-
3a
3a
3
6a
6
8
12
18
20
20
25
50
80
100
-
3
6
6
8
12
12
20
30
50
60
100
-
3a
3a
3
6a
6
8
12
18
20
20
25
50
80
100
-
3
6
6
12
20
25
40
50
80
-
3
6a
6
8
12
12
25
40
40
60
80
3a
3a
3a
3
6a
6
6
6
12
12
18
25
40
50
80
-
3
3
6
6
12
18
25
40
50
80
-
6
8
12
12
25
40
40
60
80
3a
3a
3a
3a
6a
6a
6
6
8
12
18
25
40
50
80
-
3
3
6
12
18
20
40
50
60
80
3
3
6a
6a
6
8
18
25
25
40
60
60
80
3a
3a
3a
3a
3
3
6a
6a
6
6
8
18
25
30
50
80
80
-
NOTE: Recommended fuses meet inrush criteria of 12 times transformer full load current of 0.1 second, and 25 times transformer full load for 0.01 second.
Column A = 140 - 200% of transformer rating.
Column B = 200 - 300% of transformer rating.
Shaded area indicates parallel fuse applications.
a. Fuse allows load greater than 300%.
b. Recommendations are based on fuse melting characteristics at ambient temperature of 40°C. Fuses have been derated 0.4% per degree C above 25°C.
c. Recommendations are based on fuse melting characteristics at maximum oil temperature of 100°C. Fuses have been derated 12% plus 0.2% per
degree C above 25°C.
d. For 26.7 kV phase-to-phase applications, contact your Cooper Power Systems representative. Request Application Guide CP8708.
e. Limited to gnd Y/gnd Y transformer with no more than 50% delta connected secondary load (Phase-to-ground rated fuses are frequently recommended
for Y-Y connections.)
METHOD B
Using Time Current Curves
To determine or confirm the ELX fuse
that will coordinate with upstream and
downstream system requirements, use
the time-current characteristic curves
and specify the fuse indicated from
Table 4.
For full size TCC curves, contact
your Cooper Power Systems
representative.
© 2007 Cooper Power Systems, Inc., or its affiliates
IEEE Standard C57.92™ and IEEE Standard C57.109™ are trademarks of the Institute of Electrical
and Electronic Engineers, Inc.
1045 Hickory Street
Pewaukee, WI 53072
www.cooperpower.com